I'm having major network troubles with my MacBook of late. I'll connect through wireless or wired (direct to my cable modem), and I'll lose my connection after a certain amount of time, usually a few hours. The weird thing is that I can restore my connection if I restart my MacBook, which to me seems like a software issue of some kind. What frustrates me is that I'm not doing anything to trigger the networking loss--it just happens, and I can't explain. Can anyone help me, or is anyone else having similar problems?